ConstraintThe product problem
A configurable cost-modeling engine that calculates AI workflow spend across model tokens, tool calls, and flat operational charges. The engineering challenge is to turn that scope into a legible system with explicit inputs, dependable workflow boundaries, and an outcome that can be inspected and maintained.
SystemThe architecture decision
The reviewed implementation routes financial inputs / rules through validation & calculation engine, crosses business & reporting services where required, and produces financial record / calculation.
OutcomeThe operating result
Costing Formula is included as documented engineering work. Its source structure, technology stack, and functional flow are presented here even though no verified public deployment is currently available.